Usada spent four years investigating Salazar in all before handing out its ban in 2019, when Dr Jeffrey Brown, a Nike-paid endocrinologist who treated many of Salazar’s athletes, was also been banned for four years.

Briton Farah, a four-time Olympic champion, has never failed a drugs test and has always strongly denied breaking any rules.

Farah confirmed in November that he will return to track competition in 2020 to defend his Olympic 10,000m title at the Tokyo Games.

The six-time world champion had switched his focus to road races since 2017 but says the decision to compete on the track again “wasn’t difficult at all”.

He added: “Two years went by and then you watch a championship and see people you competed against week in week out. I felt like I was there as I was getting involved watching the races and from that point I was like ‘I want to get back on the track’.

“I want to go out there, see what I can do for my country and win medals.”